Alpha-halogen-isovaleryl-urea and process of making the same.



alpha-brom-isovaleric acid that may have UNITED sra'rne Parana OFFICE ERNST SAAM, OF LUDWIGS HAFEN-ON THE-RHINE, GERMANY, ASSIGNOR TO- THE FIRM' OF KNOLL AND COMPANY, OF LUDWIGSHAFEN-ON-THE-RHINE, GERMANY.

ALPHA-HALOGEN-ISOVALEREL-UREA AND PROCESS OF 'IVING 'rrm =SAME.

Application filed Januuy 2a, 1907.

To all whom it may concern:

Be it known that I, ERNST SAAM, a subject of the German .Emperor, residing at Lud wigshafen-onthe-Rhine, Germany, have invented a certain new and useful Chemical Product, Alpha-Halogen-Isovaleryl-Urea, and Process of Preparing the Same, of which the following is a specification.

If urea is caused to act on alpha-halogenisovaleryl-bromid or alpha-halogen-isovalv eryl-chlorid, ureacompounds of alpha-halogen-isovaleryl are produced which hitherto have not been described in chemical literature, and which form excellent soporifics free from injurious secondary efiects. They are suitable in all cases of insomnia which are not caused by physical pains, but by nervous excitement, that is to say in cases, where physicians would rather not use any of the known and more or less objectionable soporifics.

The following examples will explain the details of procedure:

Example I: 2 kilograms of brom isovaleryl-bromid are intimately mixed with one kilo'of finely pulverized and well-dried urea. The urea is thereby slowly dissolved, and spontaneous heating of the mixture up to about C. takes place. At this temperature the mixture is maintained for several hours, until the bromid is no longer perceptible by its smell. The chemical reaction taking place may be represented by the following equation Subsequently the mass is treated with sodium-bicarbonate, in order to remove any.

been formed and also the hydrobromic acid. The product remaining behind is dried and recrystallized from toluene or water.

The urea com ound of alpha-brom-isovaleryl forms sma White and almost tasteless needles, which are easily soluble in hot water, alcohol, ether and in alkalies; but sparingly soluble in cold water. From its solution in a ten per cent. soda lye the new compound is precipitated by the addition of acids. Its melting point is 154 C.

Example II: To 331 grams of isovalerylchlorid are'added 480 grams of bromin by causing the latter to flow into the former, and the mixture is heated upon a water-bath until the color of bromin' has disappeared.

Specification of Letters Patent.

Patented March 9, 1-909.

Serial No. 354,465. (Specimcna) Subsequently the liquid is subjected to fractional distillation in vacuo, whereby at120 millimeters pressure and atemperature of -90 to 110 C. a clear liquid is obtained which represents the chlorid of alpha-bromrisovaleryl. The; latter is then treated as described in Example I. The chemical reaction may be represented by the following equations Example III: 2 kilograms of alpha-chlor isovaleryl-chlorid, produced from alphachlor-isovaleric acid and phosphorus oxy- 1 chlorid, are mixed with 2.5 kilograms of urea,

and the mixture is then left to itself. The temperature rises to about- 35 C. When the temperature has fallen, the roduct is heated on the Water-bath, until t e odor of the chlorid has disappeared. The mass is then treated with a solution of sodium bicarbonate, the product remaining behind is dried and recrystallized from toluene or water. The chemical reaction may be represented by the following equation:

oancncicocnnNn.co.Nn,= I

caroncrconnconn, H01.

The urea compound of alpha-chlor-isovaleryl melts, at 139 C. and resembles as regards its other properties the urea-compound of alpha-brom-lsovaleryl.

Example IV: 2 kilograms of alpha-chlorisovaleryl bromid produced from alpha chlor-isovaleric acid and phosphoric tr1bromid, are mixed with 2 kilograms of urea. other respects the treatment is as in'Exampie 3. The chemical reaction may be represented by the following equation GSHTCHCLCOBMHNH.CO.NH,= 7QII CHCLCONHEONH,+HBr;

In the above examples the urea combines with the chlorid or b'romid of alpha-isovaleryl in the proportion of one molecule of the former to one molecule of the latter.

What I claim is 1. The herein described process for obtamlng urea-compounds of alpha-halogenisovaleryl, which consists in causing urea to act on a halogen compound of alpha-halogenisovaleryl 1n the proportion of one molecule of the former to one molecule of the latter, .treating the resulting mass with sodiumbicarbonate, then drying and recrystallizing the resulting product.

2. The herein described process for the manufacture of alpha-broln-isovaleryl-urea, Which-5: consists in causing urea to act on alpha brom-isovaleryl bromid, treating the resulting mass with sodium-bicarbonate, then drying and recrystallizing the resulting product. p

3. As new products of manufacture, urea compounds of v alpha-halogen-isovaleryl obtainable from ureas and the halogenids of alpha-halogen-isovaleryl in molecular proportions, the said compounds being crystaleiaeia lizable as small white needles ca able of melting Without decomposition, sai needlesbeing easily soluble in hot water alcohol, ether and alkalies, sparingly soluble in cold Water, capable of being precipitated from their solution in a 10 per cent. soda lye by the nesses.

ERNST SAAM; Witnesses:

Max DRAEGE, OSWALD Kane. 

